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SmartFlex® I Maintenance Powder
SmartSupplements by SmartPak — Item #13523
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Maintains healthy joints

  • 4,000 mg of glucosamine, 5,000 mg of MSM & 1,250 mg of vitamin C support joint health
SmartFlex I Maintenance provides cost-effective joint maintenance for all horses in light work. This formula contains 4,000 mg of glucosamine, 5,000 mg of MSM, and 1,250 mg of vitamin C. Sugar- and filler-free with an apple flavoring horses love, SmartFlex I Maintenance provides the fundamentals of joint health for horses in light work.


View our Joint Supplement Comparison Chart

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Active Ingredients per 11 g:
(Maintenance Dose = 1 scoop (11g) daily)
  • Methylsulfonylmethane (MSM)
    5,000 mg
  • Glucosamine HCl (shellfish)
    4,000 mg
  • Ascorbic Acid (Vitamin C)
    1,250 mg
Inactive Ingredients:: Apple Flavoring.


Instructions for Use:
Horse Weight Recommended Amount
Under 500 lbs. 0.5 scoops
500 - 1000 lbs. 1 scoop
1000 - 1500 lbs. 1 scoop
Over 1500 lbs. 1.5 scoops
Directions for Use: Administer 11 g daily, 1 scoop = 11 g.

Clinical Research

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    out of 5
    93% of customers would recommend this product to a friend!
    Tell us what you think!

    The reviews provided on this website represent the experience of the individual posting the review. We do not adopt, edit, or endorse any of the submissions posted within the reviews section. Rather, the reviews are part of an online community of animal owners that desire to share their particular experience with other individuals. These reviews are not a substitute for discussing the health of your animal with a veterinarian.

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    SmartFlex® I Maintenance Powder is rated 4.6 out of 5 by 194.
    Rated 5 out of 5 by from Love it! I saw major results in my 15 year old mare after a couple weeks! She has really always been stiff and she is so much more loose and willing to work while on this product. Absolutely love it!
    Date published: 2016-03-28
    Rated 5 out of 5 by from Easy to use
    Date published: 2016-01-28
    Rated 4 out of 5 by from Smells good! Good stuff! My horsey loves it! Just be careful with it because it's really powdery!
    Date published: 2016-01-07
    Rated 5 out of 5 by from Good product Been on this about 2 months and I have seen improvements in both horses on it.
    Date published: 2015-11-18
    Rated 5 out of 5 by from Really helps my young horse.. Since I started giving this supplement to my ever growing 2 year old Quarter horse, the creaks and pops in his joints has stopped. He is moving more comfortably now during these painful growth spurts.
    Date published: 2015-10-19
    Rated 2 out of 5 by from Not so great! One of my OTTBs has a knee injury. I switched him for this product to the higher dosage one, II, and he is doing better. The I is just not strong enough for him since the FL humidity really seems to bother that knee!
    Date published: 2015-10-03
    Rated 4 out of 5 by from Great maintenance supplement Use this on my semi-retired trail horse for maintenance. Great combination of ingredients for the price.
    Date published: 2015-07-21
    Rated 5 out of 5 by from Smart flex maintenance My 20 year old dressage horse is feeling sound and spunky on this supplement.
    Date published: 2015-07-03
    Rated 5 out of 5 by from Rescue horse success i rescued a mare last year & not knowing how her life had been (other than starving) I decided to start her on a maintenance dose just to play it safe. So far must be working since she has no stiffness or joint issues.
    Date published: 2015-04-08
    Rated 5 out of 5 by from Great I just started my horses in this last month and they are all doing great! I definitely see results already.
    Date published: 2015-03-27
    Rated 5 out of 5 by from
    Date published: 2015-03-16
    Rated 5 out of 5 by from Growing Strong! I have my horse and hinny on this product. They are both benefiting from it. I can see my baby, the hinny (2-3 years) growing stronger each day. We love SmartPak!
    Date published: 2015-02-27
    Rated 4 out of 5 by from
    Date published: 2015-02-17
    Rated 3 out of 5 by from OK, but smells funny My horse will eat this supplement - seems to do well for her - but it smells strongly like vinegar.
    Date published: 2015-02-03
    Rated 5 out of 5 by from Easy to feed Was worried that my mare wouldn't eat the powder form but she never batted an eyelash at it!
    Date published: 2015-01-15
    Rated 4 out of 5 by from Good for maintenance Bought this for our Cowhorse in the off-season. Seems to keep her comfy, and relatively economical.
    Date published: 2015-01-07
    Rated 5 out of 5 by from Just what he needed I recently took possession of an older schoolmaster and although he his temperament never showed it, you could see the 'tell-tale' signs of a life if lessons. Stiffness, soreness but never unwilling. A friend who had a lesson program of 5 horses in their 20s recommended Smartpak Maintenance. Her guys ( and one mare ) look and act young and vibrant. I'm on my second order and I've begun to see a difference in Simon. A trot to meet me; a lope after a good dirt roll. He's feeling better and that's all that matters!... I hope Smartpak Maintenance can keep him feeling this good for many years to come.
    Date published: 2014-12-23
    Rated 5 out of 5 by from Works good My horse has been on this for a month now and he seems to enjoy it. He doesn't seem as stiff.... I will keep him on it and see how it goes.
    Date published: 2014-11-20
    Rated 5 out of 5 by from Great supplement An effective yet affordable supplement. I have the powder and my horse is a bit finicky when it comes to supplements and he eats it in his grain without a problem
    Date published: 2014-11-12
    Rated 5 out of 5 by from Great supplement for the money
    Date published: 2014-11-05
    Rated 5 out of 5 by from My horse loves the flavor! I started this supplement on my daughter's gelding. He loves the flavor and licks his bucket clean. I'm glad he's getting the extra joint supplement to keep him healthy.
    Date published: 2014-10-15
    Rated 5 out of 5 by from Got this for my OTTB He has only been on it for a month, but he does like the taste. Waiting to see if it helps with some track issues.
    Date published: 2014-09-02
    Rated 4 out of 5 by from Old Horse, New Improved Movement My 28 year old eventing horse has found comfort and more freedom of movement since we started started using SmartFlex I. It has made a remarkable difference in his daily movement and ease of grooming.
    Date published: 2014-08-12
    Rated 5 out of 5 by from
    Date published: 2014-08-11
    Rated 5 out of 5 by from Made my mule much more comfortable! Ruby (my mule) has been on SmartFlex I for about a month, and she is feeling a difference! She's only 8 years old, but I believe perhaps some circumstances in her early life (before I got her) caused some minor joint issues. I had a "gut feeling" that she wasn't as comfortable as she could be, and a couple of joints were popping a little, so I called SmartPak (of course!). We got her started on this product, and the difference is wonderful! She's gaited, and she now performs her gaits so beautifully, as if to say "Hey, thanks! I feel great now!" We are very happy with SmartFlex!
    Date published: 2014-07-18
    Rated 5 out of 5 by from Great for younger horses! I have had my 4 year old on this and while I haven't noticed a huge difference in his performance because he's not competing hard, I know that I am working to prevent any injuries or damage to joints, tendons, ligaments and muscles. Worth it to me!
    Date published: 2014-06-25
    Rated 4 out of 5 by from Great product! My horse can pick thru supplements but he loves all the ones from SmartPak
    Date published: 2014-05-03
    Rated 3 out of 5 by from Wish I saw a difference I had this as part of my pak's, and I don't know if it was this product or another powder, but my gelding wouldn't touch it and it ended up on the ground. Guess I will have to stick to pellets!
    Date published: 2014-04-14
    Rated 5 out of 5 by from ITS GREAT!! Started using this product on my 25 year old mare after a friend told me about how it help her senior horse .Because my mare is so picky about joint supplements I was afraid to try it but I did . My mare loves it she licks the bowl clean and moves like a 5 year old thank you smartpak team
    Date published: 2014-02-18
    Rated 5 out of 5 by from Works great! I have an 18 year old gelding on this who i brought back into work after a 10 year layoff. He had had a previous hock injury so I wanted to start him on a joint supplement as he is now back in work as a lesson horse. So far I have had no issues with his hocks. I feel better knowing that this product is helping him stay fluid in his joints. I have not noticed a difference in his movement or anything but it wasnt bad to begin with, I am strictly doing this as preventative medicine. He also eats it very well as a powder in his grain.
    Date published: 2014-01-13
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